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Journal of Chemistry
Volume 2013, Article ID 383921, 5 pages
http://dx.doi.org/10.1155/2013/383921
Research Article

Modification of Gold Surface with Gold Nanoparticles and Cyclohexyl Dithiocarbamate as a Selective Sensor for Cysteine

1Department of Chemistry, Faculty of Science, The University of Jordan, Amman 11942, Jordan
2Faculty of Sciences and Humanities, Salman bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia

Received 21 November 2012; Accepted 5 December 2012

Academic Editor: Concha Gimeno

Copyright © 2013 Ehab AlShamaileh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The self-assembly of cyclohexylamine dithiocarbamate (C6DTC) on gold (Au) and gold nanoparticles (AuNPs) was studied electrochemically using cyclic voltammetry (CV). Cyclic voltammetry was used to study the system at the electrode surface of (C6DTC/Au) and (C6DTC/AuNPs). The application of the resulting chemically modified surface as a selective sensor for cysteine, among other amino acids, was investigated. Linear oxidative desorption technique was used to characterize the modified electrode that consists of the self-assembled monolayer of cyclohexylamine dithiocarbamate on gold nanoparticles deposited on Au electrode (C6DTC/AuNPs/Au). The results showed an enhancement in the oxidation peak of cysteine on the modified electrode and hence a greater sensitivity.